The 3M E-A-Rsoft Metal Detectableable Earplugs are made from slow expanding polyurethane foam material, that gives evenly distributed pressure allowing flexibility and a good seal with optimum comfort. With the advantages of the E-A-Rsoft with the added benefits of a blue detectable Cord and an integral stainless steel ball in the non-food blue Earplug. Ideal for use in food manufacturing industries. SNR 36dB H34dB, M34dB, L31dB.